pyroclastic rocks - vertaling naar arabisch
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pyroclastic rocks - vertaling naar arabisch

ROCKS COMPOSED SOLELY OR PRIMARILY OF FRAGMENTS DERIVED FROM EXPLOSIVE VOLCANIC ACTIVITY
Pyroclastic; Pyroclastic rocks; Pyroclastics; Pyroclastic material; Pyroclastic deposit
  • Rocks from the [[Bishop Tuff]], uncompressed with [[pumice]] on left; compressed with [[fiamme]] on right.
  • Katla]] in [[Iceland]]. Find spot: Beach near [[Vik]] at the end of road 215. Acquisition done using "CT Alpha" by "Procon X-Ray GmbH", Garbsen, Germany. Resolution 11,2μm/[[Voxel]], width approx. 24 mm.
  • 3D-Rendering of the above image stack, in parts transparent. Heavy particles in red.

pyroclastic rocks         
قذيفة صخرية بركانية جـ قذائف
STONES         
  • Sedimentary [[sandstone]] with [[iron oxide]] bands
  • Rock [[outcrop]] along a mountain creek near [[Orosí]], [[Costa Rica]].
  • Sample of igneous [[gabbro]]
  • Raised garden bed]] with natural stones
  • A [[balancing rock]] called ''[[Kummakivi]]'' (literally ''"strange stone"'')<ref>[http://unusualplaces.org/kummakivi/ Kummakivi], Unusual Places.org.</ref>
  • A stonehouse on the hill in [[Sastamala]], Finland
  • Metamorphic banded [[gneiss]]
  • Ceremonial [[cairn]] of rocks, an [[ovoo]], from [[Mongolia]]
  • Mi Vida uranium mine]] near [[Moab, Utah]]
NATURALLY OCCURRING SOLID AGGREGATE OF ONE OR MORE MINERALS OR MINERALOIDS
Rocks; Rock (medium); Rock geology; Stones; Rock type; The three types of rocks; Rock types; Stone; Rock (Geology); 🪨; Stone (geology)

ألاسم

حَجَر

الفعل

رَجَمَ

الصفة

حَجَريّ

IGNEOUS         
  • Natural columns of igneous rock separated from each other by [[columnar joint]]s, in [[Madeira]]
  • Sample of basalt (an extrusive igneous rock), found in [[Massachusetts]]
  • doi-access=free }}</ref> Blue area is roughly where alkaline rocks plot; yellow area is where subalkaline rocks plot.
  • fractional crystallisation]] in a [[magma]]. While cooling, the magma evolves in composition because different minerals crystallize from the melt. '''1''': [[olivine]] crystallizes; '''2''': olivine and [[pyroxene]] crystallize; '''3''': pyroxene and [[plagioclase]] crystallize; '''4''': plagioclase crystallizes. At the bottom of the magma reservoir, a [[cumulate rock]] forms.
  • [[Gabbro]] specimen showing [[phaneritic]] texture, from Rock Creek Canyon, eastern [[Sierra Nevada]], California
  • Formation of igneous rock
  • Close-up of granite (an intrusive igneous rock) exposed in [[Chennai]], India
  • [[Lopolith]]
}}
  • [[Volcanic eruptions]] of lava are major sources of igneous rocks. ([[Mayon]] volcano in the Philippines, erupting in 2009)
  • Basic classification scheme for igneous rocks based on their mineral composition. If the approximate volume fractions of minerals in the rock are known, the rock name and silica content can be read off the diagram. This is not an exact method, because the classification of igneous rocks also depends on other components, yet in most cases it is a good first guess.
  • Extrusive igneous rock is made from lava released by volcanoes
ONE OF THE THREE MAIN ROCK TYPES; FORMED THROUGH THE COOLING AND SOLIDIFICATION OF MAGMA OR LAVA
Igneous rocks; Igneous Rock; Magmatic rock; Igneous Rocks; Magmatic rocks; Igneous; Igneus rock; Instrusive Rock; Igneous deposition; Decompression melting; Igneous body; Igneous mineral

الصفة

بُرْكَانِيّ ; نارِيّ

Definitie

pyroclastics
pyroclastic material.

Wikipedia

Pyroclastic rock

Pyroclastic rocks (derived from the Greek: πῦρ, meaning fire; and κλαστός, meaning broken) are clastic rocks composed of rock fragments produced and ejected by explosive volcanic eruptions. The individual rock fragments are known as pyroclasts. Pyroclastic rocks are a type of volcaniclastic deposit, which are deposits made predominantly of volcanic particles. 'Phreatic' pyroclastic deposits are a variety of pyroclastic rock that forms from volcanic steam explosions and they are entirely made of accidental clasts. 'Phreatomagmatic' pyroclastic deposits are formed from explosive interaction of magma with groundwater.

Unconsolidated accumulations of pyroclasts are described as tephra. Tephra may become lithified to a pyroclastic rock by cementation or chemical reactions as the result of the passage of hot gases (fumarolic alteration) or groundwater (e.g. hydrothermal alteration and diagenesis) and burial, or, if it is emplaced at temperatures so hot that the soft glassy pyroclasts stick together at point contacts, and deform: this is known as welding.

One of the most spectacular types of pyroclastic deposit is an ignimbrite, which is the deposit of a ground-hugging pumiceous pyroclastic density current (a rapidly flowing hot suspension of pyroclasts in gas). Ignimbrites may be loose deposits or solid rock, and they can bury entire landscapes. An individual ignimbrite can exceed 1000 km3 in volume, can cover 20,000 km2 of land, and may exceed 1 km in thickness, for example where it is ponded within a volcanic caldera.